Before: (66 million years ago + one day)
Next day
After (10 million years or so)
K-Pg boundary (legacy K-T boundary)
https://en.wikipedia.org/wiki/Cretaceous%E2%80%93Paleogene_boundary
Some kids at the natural history museum ask the janitor emptying waste bins how old a dinosaur was in the museum. Janitor says 200 million and thirty two years old. They ask how can he be so precise. He says when I started working here they said it was 200 million years old.